pettit



(Hommel.) f

' E. T. PETTIT.

'PERPORAHNG 'DEVICE Patented 'June 2O INVENTOR WITNESSES ATTORNEYS.

UNITED STATES PATENT OFFICE.

EDWIN T. PETTIT, OF MARSHALLTOVVN, IOWA, ASSIGNOR TO HIMSEL AND GEORGEE. KESTER, OF SAME PLAGE.

PERFoRATlNe DEVICE..

SPECIFICATION forming part of Letters Patent No. 259,910, dated June 20,1882.

v Application led December 29, 1881. (No model.)

To all whom it may concern:

Be it known that I, EDWIN T. PE'r'rI'r, ot' Marshalltown, in the countyof Marshall and State of Iowa, have invented a new and lmprovedPerforating Device, of which the following is a full, clear, and exactdescription.

My invention consists of a perforator having such construction thatthecutting-edgeof the blade is adapted to rest on a level with or a littlebelow the printing-surface of the type, so as not to interfere with theinking of the type, and to be elevated into position for perforating thesheets at the time or alittle before the impression is taken.

Reference is to be had to the accompanying drawings, forming part ofthis speeiticatiomin which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a side elevation of my improved perforator. Fig. 2 is a sideelevation with-the plates removed. Fig. 3 is a cross section taken onthe line x, Fig. 2; and Fig. 4 is a perspective view of a type-frame,showing the manner of holding the perforator for use.

A represents the blade ot' the perforator, which is formed with theinclined faces b c, inclined slot d, and is formed at one end with theincline, as shown at e. The blade is held between the plates B and C,the latter being a plain plate formed with the perforations i 'a' forthe passage of the dowel-pins i i', which are formed upon the innersurface of the plate B. The plate B is recessed upon the inside, so asto form the inclined faces or shoulders f and g,which correspond withthe inclined faces b and c oftheblade, and so as to form the offset h atone end,as shown in Figs.2 and 4, and the said plate is formed with thestud which tits in slot d, and with the stud k, which serves as a stopto the sliding triangular plate D, as clearly shown in Fig. 2. Thetriangular plate D is formed with the slot or hole lo', and is placedbetween the plates B and C, so as to come between the beveled ende ofthe blade and the offset h of the plate B, as shown in Fig. 2.

Between the offset h and the edge of the plate is placed the narrowstrip of metal l,

which is slightly recessed in the center, and

ts on and is held in place by -the set-screw n, which passes through theoti'set 7L and serves to adjust the distance of movement and elevationof the blade.

At the opposite end of the plate C to that at which the set-screw isplaced is secured by the screw p the flat spring N, which impingesagainst the end of the blade and holds the blade at all times in contactwith the diagonal edge of the triangular plate. The triangular plate isof such size or width in relation to the width of the plates B and C andthe width ot the blade that when in place it will be adapted to projectfrom between the plates a greater distance than thecutting-edge of theblade, as clearly shown in the drawings.

- yIn use the perforator is to be' locked up in the form with the typeand wedged in place, as clearly shown in Fig. 4, so that the cuttingedgeot the blade will normally stand typehigh;7 or nearly so. The triangularplate will then be adjusted by the screw a according to the thickness ofthe paper to be printed. Thus arranged, it will be seen that as theimpression is about to be taken the triangularv plate will be forcedbackward between the plates, causing the blade to be movedlongitudinally and also elevated by its movement up theinclines of theplate B, so that atthe time the impression is taken the teeth `of thecuttingedge of the bladewill perforate the paper. As soon as pressure isremoved from the triangular plate the spring N will force the bladebackward and downward below the surface of the type, out ofthe way ofthe inking-roller.

I do not confine myself to the use of the triangular plate and theinclined faces for moving the blade, as other means for this purposemight bedevised and notdepart from theprinciple of my invention. Y

It will be seen that no matter how tightly the perforator may be lockedin the form the blade will always move freely between the side plates ofthe perforator and always do its work.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, isl 1. The perforator blade havinginclined faces b c, inclined slot d, and end incline, e, in combinationwith the plate B, having pins i' i', inclined faces j' g, offset; h, andstud k, the plate C, having perforations i i, the slidin g tri- 5angular plate D, having hole 7c', the metal strip Z, and the set-screwn, as and for the purpose described.

2. In combination with the blade A, plates B, C, and D, and the springN, the screw n and the bar l, for adjusting the blade, sub- 1ostantially as described.

EDWIN THOMAS PETTIT.

Witnesses:

C. D. MEAD, G. F. VALIANT.

